Improved microstructure and mechanical properties in gas tungsten arc welded aluminum joints by using graphene nanosheets/aluminum composite filler wires

Electro-deposition of graphene on aluminium open cell metal foams

“…Graphene can substitute silicon in processors and solar panels [11,12] or, combined in a sandwich structure, it can work like a transistor. Furthermore, graphene can be exploited as electrodes for ultra capacitors, anode material for lithium batteries, thermally conductive films and coatings, films or coatings for EMI shielding, additive for composites of metal origin [10,13].…”

Effect of TiC nanoparticles on the microstructure and mechanical properties of gas tungsten arc welded aluminum joints

“…Furthermore, rapid advances of nanotechnology in recent years enable the development of advanced fillers for GTA welding. Fattahi et al (2014Fattahi et al ( , 2013) observed a significant grain refinement when the fillers of GTA welding were modified with carbonaceous nanomaterials. Grain refinement was attributed to the augmented nucleation and the pinning force of nanoparticles against the grain growth during solidification.…”

Microstructure and nanoindentation behavior of Cu composites reinforced with graphene nanoplatelets by electroless co-deposition technique

“…Apparently, the hardness of the composites increased with the increase of adding GO contents (0–5 mg/L), but then significantly decreased with further increasing the content of GO in the bath. Based on the previous research on carbon reinforcement metal material, the strengthening mechanisms for RGO/Cu composites can be attributed to synergistic effect of grain refinement 2, 6, 14, 37 , load transfer 2, 38, 39 , thermal expansion mismatch 14, 39–41 and Orowan looping 39, 40 .…”

“…Obviously, the crystallite size of RGO/Cu composites firstly decreased with the increase of GO content in the electrolyte from 1 mg/L to 5 mg/L, then increased with further adding GO from 5 mg/L to 7 mg/L. Actually, proper content of graphene can effectively restrict the growth of metal crystallites 2, 14 . This could be ascribed to two reasons: (1) graphene in the matrix would precipitate at the grain boundaries during solidification and act as a barrier for crystals growth, and (2) graphene can provide more supporting sites for metal nucleation because of their high specific surface area.…”

“…Besides that, it also faced detrimental interfacial reaction of graphene and metal matrix at high temperature 3 . Therefore, several novel approaches have been developed such as electro-deposition 11, 12 , friction stir processing 13 and gas tungsten arc 14 . Friction stir processing and gas tungsten arc, as solid state methods, both operated at high temperature with complicated equipment.…”